Suction nozzle



1936 v G. E. LOFGREN- 2,027,543

- SUCTION NOZZLE Filed. Oct. 7, 1935 2 Sheets-Sheet 1 g J v ATTORNEY1935- G. E. LOFGREN- 2,027,543

SUCTION NOZZLE Filed Oct. 7, 1935 2 sheets-sheet 2 .23 a" u. Z I u x vi/m0 m W-W/MW fizzy. 6; i7 46 F 2f jfl 4 j Patented Jan. '14, 1936 UNITEDSTATES 2.027.543 I SUCTION nozzm Gustaf Einar Lotgren, Rye, N. Y.,assignor t'o Electrolux Corporation, Dover, Deb, a. corporation ofDelaware Application October i, 1933,' Serial No. 692,565

3 Claims. (Cl. 15-157) My invention relates to suction nozzles forvacuum cleaners and more particularly to nozzles .for picking up hairsor fibers which are relatively difficuit to pick up with nozzles usedfor large surfaces. Dog hairs and lint are difficult to pick up merelyby suction. -Mechanical agitation is also ineffective for certainfibers, threads and the like. A combination of scraping and suction ispractical, but scraping is not good for rugs and particularly forcertain rugs of fine quality because the scraping cuts off the rug.Furthermore, a tool or nozzle having teeth or other scraping means doesnot readily move on many rugs, or at least not readily in one directionon a rug. The rug is sometimes soconstructed that the nozzle movesreadily in one direction but not in the other whereas normal nozzlemovement is backwards and forwards.

The object of my invention is to provide a nozzle for readily picking uplint, hairs, threads and the like without using mechanical agitation-orscraping. To this end I use a smooth surfaced nozzle capable of glidingeasily in any d'rection on a mg or other surface, regardless of thefabric structure, and cause the air in small volume to have rotarymovement, so to speak a cyclone eflect, adjacent the surface to whichthe piece to be picked up is adhering.

Thus the vortex twists the lint or other substance and the suctionremoves it. The accompanying drawings illustrate the preferredembodiment of myinvention.

Fig. 1 is a vertical central cross-sectional view of a nozzle embodyingmy invention and is taken on theline l-l of Fig. 2; I

Fig. 2 is a sectional view of the same nozzle taken on the line 2-2 ofFig.1 and on the line 2-2 of Fig. 3;

Fig. 3 is a bottom view of the nozzle shown in Figs. 1 and 2; i

Fig. 4 is a view taken on the line 4-4 of Fig. 2;

Fig. 5 is a vertical cross-sectional view of another embodiment of theinvention, taken on lines 5-5 of Figs. 6 and 7;

Fig. .6 is a. cross-sectional view taken on the lines 8-6 of Figs. 5 and'7; and

Fig. '7 is across-sectional view taken on the line 1--1 of Fig. 5. v Thenozzle l shown in Figs. 1 to 4 comprises an oval-shaped base portion orshank H and an upper tubular portion It. On the bottom of the baseportion is a smooth contact surface l3. A

- central passage M- intersects the contact surface l3 and passesthrough the tubular portion It. The lower part or passage i4 adjacentthe 'shown by the arrows B.

contact surface 13 may be termed the mouth of the nozzle and the lowerpart of the surrounding structure, essentially the base portion l|,maybe termed the lip or lip structure of the nozzle, which surrounds thenozzle mouth. The upper or outlet part of the passage l4 istapered orotherwise formed to receive and engage the end I of an air hoseconnected to a source of suction suchas the fan of a vacuum cleaner.Passage I4 is preferably of circular cross-section as shown; It will beseen that the outlet connection is of greater cross-sectional area thanthe mouth.

A plurality of grooves. 66, which are preferably straight, are cut, castor otherwise formed in is the bottom or contact surface I3 of the nozzlel'p. These grooves l6 extend from the vertical side wall of the baseportion H to the passage 14. They open tangentially into the passage ormouth M. The passage It may be tapered inwardly at the bottom. Thenozzle may be made of one piece and of any material'such as aluminum,hard rubber, or

a phenol condensation product. It is not essential that the bottomsurface l3 be smooth but this is preferred so that the nozzle will glideeasily on the rug l'l or other surface or substance to be cleaned.

In operation, air is drawn through the passage il in the direction ofthe arrow A. The nozzle being placed against the rug l1, air is drawn.through the open-sided grooves in the direction As this air passesthrough the grooves it, it is in contact with the carpet or othermaterial to be cleaned and can 5 pick up dust or dirt therefrom.

The air enters the passage M tangentially from the grooves or channelsl8 and consequently forms a vortex, the air rotatingabout andapproaching the center of passage M. It will be seen that the lipprovides 4 a deflector for each' air stream entering the nozzle, therebyassisting the forming of the vortex. This vortex is adjacent the carpetor surface to be cleaned and the whirl of the air twists any hairsor'flbers so that they are dislodged and taken up into the air streamwhich flows on helically into the upwardly extending passage M. Thelower end of the passage may be inclined as shown so that dust particlesthrown outwardly due to centrifugal force can readily pass upwardly inthe passage ll.

Figs. 5, \8, and 'i show a duplex swivel nozzle embodying the invention.Attached to the hose end It is an elbow 20 having an internal passage 2|which corresponds to the upper part of the passage ll in the embodimentof Figs. 1 to 4. a

The elbow has an end piece 22 and is cut away at 23 to provide anopening for communication with either of the nozzle openings. The nozzleis provided with a large nozzle opening 24 and a smaller opening 25,which latter corresponds to the lower part 01 the passage I4 01' theembodiment of Figs. 1 to 4. In the position shown in the drawings theinterior of the elbow 20 is connected through the opening 23 with thevertical passage or bore 25. The. passage 25 intersects the bottomsmooth surface l3. This part oi. the nozzle is similar to that of Figs.1 to 4. A plurality oi grooves or channels it are formed in the bottomsurface and communicate tangentially with the passage 25. The elbow 20is provided with a boss 28 into which is screwed a screw 21, forming apivot whereby the body of the nozzle is adapted to rotate on the 'elbow20. One side of the nozzle is provided with a weight 28 whereby onlifting the nozzle from the floor the weighted side is moved downwardlyby gravityand the nozzle can be readily turned around. On turning thenozzle around, the opening 23 provides communication between the passage2| and the large nozzle opening 24 while closing the communicationbetween the passage 2| and the passage 25. The operation oi! the smallernozzle of this embodimen't will be clear from the description of Figs.1to4.. InthestructureshowninFlgaSto'l, the

nozzle opening 24 is used for ordinary rug cleaning and the nozzle istumedaround to use the smaller opening 25 when it is desired to pick upa thread or the like which adheres to the carpet or other material beingcleaned. 5 It will be understood that the invention is not limited tothe structure shown and may be applied in a variety of forms to avariety 01' forms and sizes of nozzle. The invention is most effective,however, if used with a small nozzle open- 10 m I claim: 1. A suctionnozzle having a mouth surrounded with a surface contacting lip, said lipbeing provided .with grooves forming communications be- 15 tween themouth and the atmosphere when the nozzle is in operative position, saidgrooves being so arranged that a single vortex of air will be producedin said mouth during the normal operation of the nozzle, said lipproviding a de- 20 flector for each air stream entering the nozzlethereby assisting the forming oi! said vortex.

2. A suction. nozzle as claimed in claim 1 in which the mouth is oicircular cross-section and the grooves are tangential to the mouth.

3. A suction nozzle as claimed in claim I having an outlet connection ofgreater cross-sectional area than the mouth.

oos'rar' EINAR 10mm. so

